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Scott, Martha R; Scott, Robert B; Rona, Peter A; Butler, Louis W; Nalwalk, Andrew J (1974): Geochemistry on manganese deposit from the Median Valley of the Mid-Atlantic Ridge. PANGAEA,, Supplement to: Scott, MR et al. (1974): Rapidly accumulating manganese deposit from the Median Valley of the Mid-Atlantic Ridge. Geophysical Research Letters, 1(8), 355-358,

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A manganese oxide crust from an extensive deposit in the median valley of the Mid-Atlantic Ridge was found to be unusually high in manganese (up to 39.4% Mn), low in Fe (as low as 0.01% Fe), low in trace metals and deficient in Th230 and Pa231 with respect to the parent uranium isotopes in the sample. The accumulation rate is 100 mm to 200 mm/10 million year, or 2 orders of magnitude faster than the typical rate for deep-sea ferromanganese deposits. The rapid growth rate and unusual chemistry are consistent with a hydrothermal origin or with a diagenetic origin by manganese remobilized from reduced sediments. Because of the association with an active ridge, geophysical evidence indicative of hydrothermal activity, and a scarcity of sediment in the sampling area, we suggest that a submarine hot spring has created the deposit.
Median Latitude: 26.877486 * Median Longitude: -41.131550 * South-bound Latitude: 26.116700 * West-bound Longitude: -45.105000 * North-bound Latitude: 30.133000 * East-bound Longitude: -25.350000
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